Mutation

China battles Covid-19 outbreak as WHO warns of Delta-fuelled spread

The rise in infections come as a leaked internal CDC document found fully immunised people with so-called breakthrough infections of the Delta variant can spread the disease as easily as unvaccinated people.

Pfizer-BioNTech updates Covid vaccine efficacy at 91%

The drug-making company says their shot was also 100 percent effective in preventing illness among trial participants in South Africa, where a new variant called B1351 is dominant, though the number of those participants was relatively small at 800.

New Covid-19 UK variant can be deadlier than the previous strain

On Friday, United Kingdom officials announced that the new coronavirus variant may have a higher mortality rate than the original strain.

Everything you need to know about the mutated, possibly airborne Covid-19

What does Covid-19’s latest mutation mean, and what exactly is behind the raging debate over airborne transmission that has the WHO under fire.

Is the world at risk of a coronavirus pandemic?

Here's an insight into what it takes to become a pandemic, and what will define whether the 2019-nCov outbreak is at risk of becoming the next global health disaster.